P102 4 - TURBO BOOST PRESSURE CIRCUIT FAILED LOW (LOW VOLTAGE)

TM 9-2320-364-20-1

2-14. DDEC III/IV TROUBLESHOOTING (CONT).

Section IV. TROUBLESHOOTING CHARTS (Cont.)

E. FLASH CODE:

J1587 CODE:

P102 4 - TURBO BOOST PRESSURE CIRCUIT FAILED LOW (LOW VOLTAGE)

NOTE - This chart is only to be used if:

1) All basic mechanical checks and physical inspections have been performed with no problem found; and,

2) Diagnosis of DDEC III/IV was started at step START-1, pg 2-539, and you have now been referred here.

STEP/SEQUENCE

RESULT

WHAT TO DO NEXT

34-1

Multiple Code Check

Were there any other active

No other codes.

Go to 34-2.

codes besides Code 102/4?

Yes, any or all

Go to ENG5V-1 (page 2-761).

of the following codes:

110/3 or 4, 175/3 or 4,

174/3 or 4, 102/3,

100/3 or 4,

187/4, 91/4.

Yes - but none

Go to 34-2.

of the above.

34-2

Sensor Check

Turn ignition off.

Code 102/3 (and

Go to 34-3.

Disconnect TBS connector

any codes except

(para 7-63).

Code 102/4).

Install a jumper wire between

sockets B and C of the TBS

Code 102/4 (and

Go to 34-4.

connector.

any other codes).

Turn ignition on.

Read active codes.

If active Code 102/3 or 4 exists,

go to RESULT column.

If no active Code 102/3 or 4

exists, start engine and run

(TM 9-2320-364-10) until either

the "Check Engine" light comes

on or the engine has been running

warm for at least one minute at

greater than 1000 RPM.

Read active codes.

34-3

Check TBS Connectors

Inspect terminals at the TBS

Terminals and

Replace TBS (para 7-63).

connectors (both the sensor and

connectors are okay.

Then go to 34-30.

harness side) for damage; bent,

corroded, and unseated pins or

Problem found.

Repair terminals/connectors

sockets.

(para 7-101). Then go to 34-30.

2-673